From: Minas Harutyunyan Date: Fri, 19 Jan 2018 10:44:20 +0000 (+0400) Subject: usb: dwc2: host: Fix transaction errors in host mode X-Git-Tag: v4.17-rc1~126^2~18^2~65 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=92a8dd26464e1f21f1d869ec53717bd2c1200d63;p=linux.git usb: dwc2: host: Fix transaction errors in host mode Added missing GUSBCFG programming in host mode, which fixes transaction errors issue on HiKey and Altera Cyclone V boards. These field even if was programmed in device mode (in function dwc2_hsotg_core_init_disconnected()) will be resetting to POR values after core soft reset applied. So, each time when switching to host mode required to set this field to correct value. Acked-by: John Youn Signed-off-by: Minas Harutyunyan Signed-off-by: Grigor Tovmasyan Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 2cb4f4f3981f..6f7f9c73b596 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -2328,10 +2328,22 @@ static int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup) */ static void dwc2_core_host_init(struct dwc2_hsotg *hsotg) { - u32 hcfg, hfir, otgctl; + u32 hcfg, hfir, otgctl, usbcfg; dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg); + /* Set HS/FS Timeout Calibration to 7 (max available value). + * The number of PHY clocks that the application programs in + * this field is added to the high/full speed interpacket timeout + * duration in the core to account for any additional delays + * introduced by the PHY. This can be required, because the delay + * introduced by the PHY in generating the linestate condition + * can vary from one PHY to another. + */ + usbcfg = dwc2_readl(hsotg->regs + GUSBCFG); + usbcfg |= GUSBCFG_TOUTCAL(7); + dwc2_writel(usbcfg, hsotg->regs + GUSBCFG); + /* Restart the Phy Clock */ dwc2_writel(0, hsotg->regs + PCGCTL);